Stocks retreated Monday, pressured by steepening declines in oil prices and signs of economic weakness in Europe and Japan.

The Dow Jones Industrial Average posted its biggest one-day loss in six weeks, falling 106.31, or 0.6%, to 17852.48. The S&P 500 index dropped 15.06, or 0.7%, to 2060.31, while the Nasdaq Composite Index declined 40.06, or 0.8%, to 4740.69.

The...

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